A kind of can bus asynchronous communication method and network based on optical fiber

Abstract

An optical fiber-based CAN bus asynchronous communication method and network, including a master node and a slave node, wherein the slave nodes can also be divided into outer ring slave nodes and inner ring slave nodes. The master node is ring-connected with the slave nodes of the outer ring, and each slave node of the outer ring can also be ring-connected with the slave nodes of the inner ring respectively to form a multi-ring structure. The invention directly realizes the physical layer architecture of the CAN bus through the optical fiber. The invention can omit the wire connection in the existing CAN bus, and directly transmit the CAN data through the optical fiber. When implementing high-power paralleling, on the one hand, the present invention can realize mass and real-time data transmission through optical fibers; on the other hand, it can also use optical fiber modules to realize CAN communication, so as to save the physical connection of CAN bus. When the number of CAN nodes is large, the present invention can save the trouble of setting the matching resistance of each node on the CAN bus. The CAN network of the present invention is convenient and flexible in networking, and has the convenience of expanding the number of network nodes.

Description

technical field [0001] The invention relates to asynchronous communication technology, in particular to a CAN bus asynchronous communication method and network. Background technique [0002] The CAN bus is a serial communication protocol bus used for real-time applications. The CAN bus has two states of "dominant" and "recessive". The dominant corresponds to logic 0 and the recessive corresponds to logic 1. If two nodes send "0" and "1" at the same time, "0" appears on the bus. The CAN bus uses a binary non-return-to-zero encoding method, so there is either 0 or 1 on the bus. A node on the CAN bus sends data, which is broadcast to all nodes in the network in the form of a message. For each node, no matter whether the data is sent to itself or not, it will receive it. The 11 characters at the beginning of each group of messages represent identifiers, which are used to define the priority of the messages. Within the same system, the identifier is unique and can identify dif...

AI Technical Summary

Problems solved by technology

However, there is currently no technology capable of realizing CAN bus asynchronous communication over fiber optic media

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